Datasheet > ISL78220

ISL78220

更新时间： 2024-11-20 02:57:35

品牌	Logo	应用领域
瑞萨 - RENESAS		/
页数	文件大小	规格书
22页	1256K
描述
6-Phase Interleaved Boost PWM Controller with Light Load Efficiency Enhancement

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ISL78220 数据手册

DATASHEET

ISL78220

FN7688

Rev 4.00

September 2, 2014

6-Phase Interleaved Boost PWM Controller with Light Load Efficiency

Enhancement

The ISL78220 6-phase controller is targeted for applications

Features

where high efficiency (>95%) and high power are required. The

• Peak current mode PWM control with adjustable slope

compensation

multiphase boost converter architecture uses interleaved

timing to multiply channel ripple frequency and reduce input

and output ripple. Lower ripple results in fewer input/output

capacitors and therefore lower component cost and smaller

implementation area.

• Precision resistor/DCR current sensing

• 2-, 3-, 4- or 6-phase operation

• Adjustable phase dropping/diode emulation/pulse skipping

for high efficiency at light load

The ISL78220 has a dedicated pin to initiate the phase

dropping scheme for higher efficiency at light load by dropping

phases based on the load current, so the switching and core

losses in the converter are reduced significantly. As the load

increases, the dropped phase(s) are added back to

• Phase dropping facilitated with companion FET driver

ISL78420 (featuring tri-level input control)

• Adjustable switching frequency or external synchronization

from 75kHz up to 1MHz per phase

accommodate heavy load transients and improve efficiency.

Input current is sensed continuously by measuring the voltage

across a dedicated current sense resistor or by inductor DCR.

This current sensing provides precision channel-current

balancing, and per-phase overcurrent protection. A separate

totalizing current limit function provides overcurrent protection

for all the phases combined. This two-stage current protection

provides maximum performance and circuit reliability.

• Over-temperature/overvoltage protection

• 2V ±1.0% internal reference

• Pb-free, 44 Ld 10x10 EP-TQFP package (RoHS compliant)

• -40°C to +125°C operating temperature range

• AEC-Q100 qualified

Applications

The ISL78220 can also provide for input voltage tracking via

the VREF2 pin. The comparison reference voltage will be the

lower of the VREF2 pin or the internal 2V reference. By using a

resistor network between VIN and VREF2 pin, the output

voltage can track input voltage to limit the output power during

automotive cranking conditions.

• Automotive power supplies

- Start/stop DC/DC converter

- Electronic power steering systems (EPAS)

- Fuel pumps

- Injection system

The ISL78220 can output a clock signal for expanding

operation to 12 phases, which offers high system flexibility.

The threshold-sensitive enable input is available to accurately

coordinate the start-up of the ISL78220 with any other voltage

rail.

• Audio trunk amplifier power supplies

• Telecom and industrial power supplies

Related Literature

• AN1726, “ISL78220EVAL1Z: 6-Phase Interleaved

Synchronous Boost Converter”

0.98

WITH PHASE DROPPING

0.97

0.96

0.95

0.94

0.93

0.92

0.91

0.90

0.89

0.88

WITHOUT PHASE DROPPING

6V INPUT, 12V OUTPUT

SYNCHRONOUS BOOST

OUTPUT CURRENT (A)

FIGURE 1. EFFICIENCY vs OUTPUT CURRENT vs PHASE DROPPING MODE

FN7688 Rev 4.00

September 2, 2014

Page 1 of 22

12 3 4 5 6 7...22

中文翻译

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与ISL78220相关器件

型号	品牌	获取价格	描述	数据表
ISL78220ANEZ	RENESAS	获取价格	6-Phase Interleaved Boost PWM Controller with Light Load Efficiency Enhancement
ISL78220EVAL1Z	RENESAS	获取价格	6-Phase Interleaved Boost PWM Controller with Light Load Efficiency Enhancement
ISL78223	INTERSIL	获取价格	ZVS Full-Bridge PWM Controller with Adjustable Synchronous Rectifier Control
ISL78223	RENESAS	获取价格	ZVS Full-Bridge PWM Controller with Adjustable Synchronous Rectifier Control
ISL78224	RENESAS	获取价格	4-Phase 12V/48V Bidirectional Synchronous PWM Controller
ISL78225	RENESAS	获取价格	4-Phase Interleaved Boost PWM Controller with Light Load Efficiency Enhancement
ISL78225ANEZ	RENESAS	获取价格	4-Phase Interleaved Boost PWM Controller with Light Load Efficiency Enhancement
ISL78226	RENESAS	获取价格	6-Phase 12V/48V Bidirectional Synchronous PWM Controller
ISL78226ANZ	RENESAS	获取价格	6-Phase 12V/48V Bidirectional Synchronous PWM Controller
ISL78226EVKIT1Z	RENESAS	获取价格	6-Phase 12V/48V Bidirectional Synchronous PWM Controller

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